Pontoon for lifting loaded ships.



No. 779,852. PATENTBD JAN. 10, 1905. A. 0. A. HOLZAPFEL.

PON'I'OON FOR LIFTING LOADED SHIPS.

APPLIOATION FILED JULY 7. 1904.

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A. 0. A. HOLZAPREL. PONTOON FOR LIFTING LOADED SHIPS.

APPLICATION FILED JULY 7. 1904.

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Patented January 10, 1905.

PATENT OFFICE.

ALBERT CHARLES AUGUSTUS HOLZAPFEL, OF LONDON, ENGLAND.

PONTOON FOR LIFTING LOADED SHIPS.

SPECIFICATION forming part of Letters Patent No. 779,852, dated January10, 1905.

Application filed July 7, 1904. Serial No. 215,693.

T 60 whom it may concern:

Be it known that I, ALBERT CHARLES AUeUs- TUS HoLzAPEEL, merchant, asubjectof the King of Great Britain and Ireland, residing at 59Fenchurch street, in the city of London, England, have invented acertain new and useful Pontoon for Lifting Loaded Ships, (for which Ihave applied for a patent in Great Britain, dated January 26, 190 1, No.1,972,) of which the following is a specification.

A method has been proposed for unloading a ship or the like wherein theship is to be raised from the Water to allow her cargo to fall throughoutlets in her sides or bottom. The simplest means for raising a ship inthis manner consists in lifting her on a pontoon which is broughtbeneath her. The present invention relates to a construction of pontoonsuitable for this purpose.

According to the'invention the pontoon is built of a length and widthabout those of the ship to be raised and has lateral arms at both endsor in various positions, such arms having raised portions or towers,which, together with the arms, are of such dimensions that by themselvesdisplacing Water they insure the stability of the pontoon when it iscarrying the ship.

Instead of a single pontoon constructed so as to allow discharge ofcargofrom the sides of the vessel two pontoons having arms and towers on oneside only may be constructed, so that discharge may occur from thebottom of the ship when she is raised.

The accompanying diagrams illustrate the invention.

Figure 1 is an end view of a pontoon which has been placed beneath avessel, here shown in crosssection, to lift her from the water to allowof her cargo being discharged through her sides. Fig. 2 in a plan ofFig. 1. Fig. 3 is a similar view to Fig. 1, the vessel being arranged todischarge her cargo through the bottom, for which purpose she is liftedon two pontoons.

Referring to Figs. 1 and 2, a is the ship, and Z) the pontoon, havingarms 0 and towers c. The normal load-line of v the ship is at (Z, andshe is lifted on the pontoon so that the 5 water-tight doors a in hersides are at a higher level than the barges f, floating alongside thepontoon. The ballast-tank g slopes downwardly from the center line tothe sides of the ship. Extending from the deck 71 to the ballast-tank atthe places where the doors a are situated are trunkways a, which projectinto the hold and have doors is making communication with the holdopposite the doors c. When the cargo is to be discharged, a man descendsthe trunkway and prepares the doors a and k for being opened.

In the modification shown in Fig. 3 there are two pontoons Z), and theballast-tanks g are at the sides of the ship, sloping toward the centerline. Between two keelsons at this part are water-tight doors in thebottom of the vessel, situated in the trunkway i, the cover of which hasdoors making communication with the hold opposite the water-tight doors,respectively. A man entering the trunkway from the stoke-hole orfore-peak prepares both doors so that they may be opened and the cargodischarged into a barge f, floating between the pontoons. 4

Having thus described the nature of my said invention and the best meansI know of carrying the same into practical effect, I claim- 1. A pontoonfor lifting loaded ships comprisingabod y, arms extending laterallytherefrom and towers on the said arms; substan tially as described.

2. A pontoon for lifting loaded ships comprising a body of a length andwidth about those of the ship to be lifted, arms extending laterallyfrom both sides thereof, and towers on the said arms, such arms andtowers being of dimensions to displace water sufficient to insure thestability of the ship; substantially as described.

3. A pontoon for lifting loaded ships'comprising a body, arms extendinglaterally from one side thereof and towers on the said arms,substantially as described;

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALBERT CHARLES AUGUSTUS HOLZAIFEL.

WVitnesses:

EDWARD GARDNER, WALTER J. SKERTEN.

